When applying fertilizer to a lawn using a spreader will make the application easier and make the distribution more uniform. The video below discuss the 2 basic types of fertilizer spreaders: rotary or broadcast and drop spreaders.
Broadcast spreaders, cover a lot of acreage quickly. If you want complete control, think about getting a drop spreader.
There are a few tips in operating a fertilizer spreader. Check out this on how you can make sure your lawn gets the food in the right amounts and places.